F?re R (1988). “Efficiency Gains from Addition of Technologies: A Nonparametric Approach.” in Eichhorn W (eds.) Measurement in Economics 20, Physics-Verlag: 171-176.
F?re R (1988). “Efficiency Gains from Addition of Technologies: A Nonparametric Approach.” in Eichhorn W (eds.) Measurement in Economics 20, Physics-Verlag: 171-176.